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Sources -- Italy and Quebec, Canada, are well known locales for yellow, green, and brown idocrase up to about 10 or 15 carats. Faceted stones often resemble grossular garnet.
Idocrase is double refractive and can exhibit positive or negative uniaxial optic character and sometimes anomalous positive or negative biaxial characteristics. Refractive indices of crystals found in serpentinites are highest with 1.705-1.750 and 1.
rutile, idocrase, zircon
Hexagonal systems
4 crystallographic axes, three of equal length, intersecting at 60 degree angles, the other three are longer or shorter and perpendicular to the first three
7 ...
actinolite, idocrase, augite, hornblende, apatite, quartz
Locals:
Misc: ...
Occurrence
Idocrase, commonly called vesuvianite, is found in the US, Norway, Siberia, Canada, Italy, Switzerland, Pakistan and Africa ...
an aggregate combo of idocrase and grossular garnet
Color: apple green
SG: 3.3
Avg.RI: 1.7
H: 5.5 to 7.5
Comments: $450.00 per ct. when cut from crystal. Calomel ... HgCl ...
Crystal: tetragonal, (minute)
Color: gray to yellowish ...
A fitting example of this is the Siberian idocrase which has three axes that are all perpendicular to one another and two are equal in length.
Vesuvianite, also known as Idocrase, is a fascinating mineral found originally on the volcano, Mt Vesuvius, hence one of the names.
Nephrite, Hydrogrossular, Serpentine, Maw-Sit-Sit, Idocrase, Chalcedony
Treatments
Dying, Wax impregnation, Heating ...
 See also: Crystal, Stone, Vesuvianite, Garnet, Zircon
  
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